A1 - A3

Pinpoint Test A: Variable Assist Power Steering Electrical Component Diagnosis

A1 Module Check
- Turn ignition switch to OFF.

Fig. 8 Diagnostic Connector Location:

- Locate test connector 14489 in engine compartment near brake booster.






- Connect DVOM positive lead (R) to Circuit 606 and negative lead (BK) to vehicle ground.
- Position DVOM where it can be observed.
- Start engine.
- Observe voltage reading on DVOM.
Does voltage read between 11-14 volts?
Yes
Go to A2.
Does voltage read zero?
Yes
Go to A3.
Does voltage read above 14 volts?
Yes
CORRECT over-voltage condition then:
Go to A2.

A2 Module Check
- Turn ignition switch to OFF.






- Connect an analog voltmeter positive lead (R) to Circuit 606 and negative lead (BK) to vehicle ground.
- Use jumper wire and ground Circuit 200.
- Start engine.
- Rotate steering wheel for approximately 90 seconds noting any changes in steering effort.
The effort required to turn the steering wheel should vary between light and heavy in both directions.
- After approximately 90 seconds the voltmeter will show a sweep pattern between battery voltage and zero.
After a five second pause, the sweep pattern will be repeated.
- Remove Circuit 200 ground before proceeding to next test.
Does the effort change with 2 sweeps?
Yes
VAPS module OK.
Go to A4. A4 - A6
Is there no effort change with 2 sweeps?
Go to A7. A7 - A8
Does the effort change with 4 sweeps?
Yes
Go to A15. A15
Is there no effort change with 4 sweeps?
Go to A7. A7 - A8
Does the effort change with 6 sweeps?
Yes
Go to A16. A16
Is there no effort change with 6 sweeps?
Go to A7. A7 - A8
Does the effort change with 0 sweeps?
Yes
Go to A16. A16
Is there no effort change with 0 sweeps?
Go to A7. A7 - A8

A3 Fuse Check
- Inspect fuse located in fuse panel on LH side below instrument panel.
Is fuse OK?
Yes
Go to A14. A14
No
REPLACE fuse.
Go to A1.